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// Copyright (c) 2011, Jens Peter Secher <jpsecher@gmail.com>
// Copyright (c) 2012, Darren Salt <linux@youmustbejoking.demon.co.uk>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
// Structure for iterating over a Process' output.
class ProcessTwoStreamIterator
implements Iter<String>
{
public function new( streamA : haxe.io.Input, streamB : haxe.io.Input, ? process : sys.io.Process )
{
lock = new neko.vm.Lock ();
pending = new neko.vm.Lock ();
pendingClaimed = true;
running = true;
this.process = process;
stream = [streamA, streamB];
thread = [neko.vm.Thread.create (runStreamA),
neko.vm.Thread.create (runStreamB)];
lines = new List<String> ();
lock.release ();
}
// First stream, usually stdout
private function runStreamA ()
{
runStream (0);
}
// Second stream, usually stderr
private function runStreamB ()
{
runStream (1);
}
// Read from a stream, a line at a time, and queue the output
private function runStream (id : Int)
{
while (true)
{
try
{
var line = stream[id].readLine ();
lock.wait ();
lines.add (line);
pendingRelease ();
lock.release ();
}
catch( e : haxe.io.Eof )
{
// Assume that EOF on one stream is EOF on both
lock.wait ();
running = false;
pendingRelease ();
lock.release ();
return;
}
catch( e : haxe.io.Error )
{
// Wait 10 ms for more input to arrive.
Sys.sleep( 0.01 );
}
}
}
// Release pending: input available and/or process terminated
private function pendingRelease ()
{
if (pendingClaimed)
{
pendingClaimed = false;
pending.release ();
}
}
// Implementation of Iterable<String>;
public function iterator() : Iterator<String>
{
return this;
}
// Implementation of Iterator<String>.
public function next() : String
{
lock.wait ();
var line = lines.pop ();
lock.release ();
return line;
}
// Implementation of Iterator<String>.
public function hasNext() : Bool
{
var length = 0;
do
{
// Get the length. If it's non-zero, return.
lock.wait ();
length = lines.length;
if (length > 0)
{
lock.release ();
return true;
}
// Otherwise, wait for input or process termination...
lock.release ();
pending.wait ();
pendingClaimed = true;
// ... and return if the process has terminated.
} while (running);
return length != 0;
}
var stream : Array<haxe.io.Input>;
var thread : Array<neko.vm.Thread>;
var lines : List<String>;
var lock : neko.vm.Lock;
var pending : neko.vm.Lock;
var pendingClaimed : Bool;
var process : sys.io.Process;
var running : Bool;
}
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